Chu Yongzhi 0000-0002-2549-0670 Shanghai Jiao Tong University https://ror.org/0220qvk04 Li Xiaohu xhli@sio.org.cn Xie Ruifang C 0000-0002-6628-9236 Conway Tim M 0000-0002-3069-9786 Xu Antao axu@geomar.de 0000-0002-5644-0852 Dong Yanhui dongyh@sio.org.cn 2026 Measured iron isotopic compositions of Fe-Mn crust sample CXD31 dataset https://doi.pangaea.de/10.1594/PANGAEA.991015 2026-04-01T08:48:12 Iron (Fe) is a key micronutrient regulating marine productivity and the global carbon cycle, yet reconstructing the relative contributions of different Fe sources through time remains challenging. Here we present high-resolution iron isotopic compositions (δ56Fe), measured by multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS), from a Fe-Mn crust sample (CXD31) recovered from the North Pacific Ocean, spanning the past ~23 Myr. The Fe isotopic values vary within the range of modern marine Fe sources, reflecting dynamic mixing among atmospheric dust, sedimentary inputs, and hydrothermal contributions. Using isotope mass-balance calculations, we reconstruct temporal changes in the relative importance of these Fe sources since the Miocene. Three intervals characterized by elevated δ56Fe values (~16.9, ~11.6, and ~2.7 Ma) indicate enhanced inputs of isotopically heavy Fe, which we attribute to increased aeolian dust supply linked to progressive aridification of inland Asia. These Fe isotope data provide a long-term record of Fe source variability in the North Pacific and offer new constraints on the coupling between continental climate evolution and oceanic Fe cycling. 173.2 173.2 19.9 19.9 173.2 19.9 2003-07-19T00:00:00 2003-07-19T00:00:00 -1357.0 -1357.0 National Key Research and Development Program of China https://doi.org/10.13039/501100012166 2023YFC2811205 National Key Research and Development Program of China https://doi.org/10.13039/501100012166 2023YFC2811305 National Natural Science Foundation of China NSFC https://www.nsfc.gov.cn/english/site_1/index.html https://doi.org/10.13039/501100001809 42376035 National Natural Science Foundation of China NSFC https://www.nsfc.gov.cn/english/site_1/index.html https://doi.org/10.13039/501100001809 U2244222 Second Institute of Oceanography, State Oceanic Administration https://doi.org/10.13039/501100013288 SZ2563 DY105-12/14_CXD31 CXD31 19.9 173.2 -1357.0 2003-07-19T00:00:00 Dredge, rock DRG_R Fe–Mn crust collected by rock dredging on a seamount slope 78 CC-BY-4.0 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ Age Age Ma age http://purl.obolibrary.org/obo/PATO_0000011 Chu Yongzhi 0000-0002-2549-0670 Age [Ma] δ56Fe δ56Fe ‰ δ56Fe http://en.wikipedia.org/wiki/List_of_elements_by_stability_of_isotopes Multiple-collector inductively coupled plasma mass spectrometer (MC-ICPMS) Chu Yongzhi 0000-0002-2549-0670 δ56Fe [‰] δ56Fe, standard deviation δ56Fe std dev ± δ56Fe http://en.wikipedia.org/wiki/List_of_elements_by_stability_of_isotopes standard deviation std dev https://en.wikipedia.org/wiki/Standard_deviation Multiple-collector inductively coupled plasma mass spectrometer (MC-ICPMS) Chu Yongzhi 0000-0002-2549-0670 2 SD δ56Fe std dev [±] CurationLevelC Enhanced curation https://wiki.pangaea.de/wiki/Curation_levels Aeolian dust Ferromanganese crust Iron biogeochemsitry Isotopic fingerprinting Marine geochemistry North Pacific author114755 author114756 author114757 author42120 author74108 author99680 award2367 award4796 award4797 award4798 award4803 curlevel30 event3351155 funder20769 funder20908 funder20961 geocode1599 geocode1600 geocode1601 geocode8128 inst22162 license21 method11544 method18729 param502940 param82117 param82118 pi114755 term1073112 term1073135 term37764 term43997 term74899 term76524 term77144 term77145 term77146